Collections for States
نویسنده
چکیده
Consider an application that holds a number of graphical objects that may be manipulated by a user, such as a CAD tool or graphical editor. The general shape of this application follows from the WORKPIECES frame [Jackson1995]. The objects manipulated by the user are the workpieces, and these may be saved to some kind of persistent storage, e.g. some kind of database. These objects all share a simple lifecycle model, in addition to their type specific state:
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